EPR, proton and carbon-13 ENDOR studies of a quintet state 13C-labeled galvinoxyl-type tetraradical
作者:Burkhard Kirste、Michael Grimm、Harry Kurreck
DOI:10.1021/ja00183a019
日期:1989.1
monoradical, a triplet-state biradical, a quartet-state triradical, and a quintet-state tetraradical, can be generated by selective oxidation and identified by EPR, /sup 1/H, and /sup 13/C ENDOR spectroscopy. The zero-field splitting parameter D is about 1.1 mT for the biradical, but is vanishingly small for the tetraradical because of its tetrahedral symmetry. An estimate of J /approximately/ 600 MHz has
描述了未标记的和四重/sup 13/C 标记的四苯基甲烷 tetrakisgalvinols 的合成。不同的顺磁性物质,即双重态单自由基、三重态双自由基、四重态三自由基和五重态四价自由基,可以通过选择性氧化产生并通过 EPR、/sup 1/H 和 / sup 13/C ENDOR 光谱。双基的零场分裂参数 D 约为 1.1 mT,但由于四面体的对称性,四基的零场分裂参数 D 几乎为零。对于多自旋系统中的标量电子交换相互作用,已经获得了 J /大约 / 600 MHz 的估计值。36篇参考文献,6幅图,2张表格。